An Additional Damping Control Method for Virtual Synchronous Generator
A technology of additional damping control and virtual synchronization, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of poor compatibility of frequency dynamic adjustment, achieve high practical value, improve stability, and solve the effects of poor compatibility
Active Publication Date: 2021-11-16
XIAN UNIV OF TECH +1
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Problems solved by technology
[0005] The purpose of the present invention is to provide an additional damping control method for a virtual synchronous generator, which solves the problem of poor compatibility between power regulation and frequency dynamic regulation of the existing virtual synchronous generator
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[0050] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0051] An additional damping control method for a virtual synchronous generator in the present invention, refer to figure 1 , including the following steps:
[0052] Step 1. Calculate the applied voltage of the virtual synchronous generator in the droop control mode
[0053] Use the voltage Hall element to collect the actual voltage U in the power generation system g , to calculate the virtual synchronous generator action voltage E under reactive power-voltage droop control U :
[0054] E. U =D Q (U n -U g ) (1)
[0055] Among them, U n is the rated voltage of the power generation system, D Q is the reactive power-voltage droop control coefficient:
[0056]
[0057] In the formula, Q n is the rated reactive power of the power generation system, Q% is the change rate of the power generation system voltage, and U% is the change rat...
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The invention discloses an additional damping control method of a virtual synchronous generator, which includes calculating the VSG action voltage in the droop control mode, calculating the frequency deviation Δω of the VSG, injecting the frequency deviation Δω into an excitation regulator, and transforming the voltage control loop of the VSG ;Under the effect of reactive power adjustment, the reference reactive power Q for the set VSG ref Integrating the tracking error with the actual reactive power Q to obtain the mutual inductance M of the stator and rotor in the VSG f and excitation current i f Product; under the simultaneous action of reactive power adjustment and frequency deviation feedback adjustment, the rotor angle in VSG is measured, combined with the mutual inductance M of the stator and rotor f and excitation current i f The corresponding PWM pulse is obtained, and finally the PWM pulse is converted into a drive signal and input into the power device, that is, the additional damping control of the virtual synchronous generator is completed. By adopting the additional damping control method of the present invention, the negative damping caused by voltage coupling can be offset, and the damping capacity and stability of the system can be improved.
Description
technical field [0001] The invention belongs to the technical field of electronic power and relates to an additional damping control method of a virtual synchronous generator. Background technique [0002] In recent years, the large-scale grid-connected application of new energy has caused tremendous changes in the composition of power generation units in traditional power systems, profoundly changing the dynamic behavior of power systems. Since most new energy electricity needs to be connected to the grid through power electronic converters, and lacks the rotor inertia support of synchronous generators (SG), the problem of frequency stability in power systems after large-scale grid connection has become increasingly prominent. [0003] In order to solve the weak inertia problem caused by new energy grid connection, the control strategy of virtual synchronous generator (virtual synchronous generator, VSG) came into being by referring to the frequency operation characteristic...
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IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/381H02J3/241H02J2203/20
Inventor 李宁张世乾王倩阎洁
Owner XIAN UNIV OF TECH